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频率，频数
math. frequency
频率，频数: 203 phrases in 34 subjects
Advertising1
Air defense10
Artificial intelligence1
Automobiles1
Aviation15
Business9
Commerce1
Earth sciences3
Economy1
Electric machinery1
Electronics27
Engineering geology2
Environment1
Explosives and Explosive Ordnance Disposal1
General5
Geophysics4
Hydrology1
Information technology2
Mathematics18
Metallurgy1
Multimedia2
Nautical3
Oil / petroleum14
Piezoelectric crystals2
Plastics1
Project management1
Rail transport1
Reproductive biology1
Shipbuilding2
Space16
Statistics4
Technology47
Telecommunications3
United Nations1

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